San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
Are Rats Nocturnal?
Biologically, rats are nocturnal. These animals come out at dusk to look for food and carry out other activities, then go back into hiding at dawn. Their choice of coming out at dusk is dependent on many things that have to do with their natural behavior and biology. Right here, we will be taking you through some of these factors.
The first factor is that rats are silent animals and will prefer to operate in an environment with less noise. Their involvement with humans and special liking for staying in places close to human settlements will make them want to stay in hiding during the day time because the activities of humans during the day causes noise that they can't cope with.
Another factor that modifies rats to being nocturnal is the fact that their instinct only makes it possible for them to feel relaxed and active when there is less danger. This is nearly impossible during the day time as many of their natural predators will be active during that exact time.
Third, rats like are sneaky and will always prefer to operate in hiding without the occupants of the house knowing. The night has limited light and the occupants are most likely to be at rest during this time. This gives rats all the time and opportunities they need to carry out their rat business without any form of interruption.
However, rats are also capable of moving around during the day if they have a safe route through which they can travel. The routes are usually dark and safe even during the day when there are noises and disturbances from humans.
